ART52 – 71 – MOD 52.221A 2) The carrier frequency 8 291 kHz is authorized on a simplex basis for distress and safety traffic only (see also Appendix 15). Calling on the carrier frequencies 12 290 kHz and 16 420 kHz shall be permitted only to and from rescue coordination centres (see No. 30.6.1), subject to the safeguards of Resolution 352 (WRC-03). The alternative carrier frequencies 12 359 kHz and 16 537 kHz may be used by ship stations and coast stations for calling on a simplex basis, provided that the peak envelope power does not exceed 1 kW. (WRC-15) MOD 52.224 § 99 1) Before transmitting on the carrier frequencies 4 125 kHz, 6 215 kHz, 8 291 kHz, 12 290 kHz or 16 420 kHz a station shall, in accordance with Recommendation ITU-R M.1171-0, listen on the frequency for a reasonable period to make sure that no distress traffic is being sent (see No. 52.221A). (WRC-15) C3 − Traffic MOD 52.229 4) Transmitters used for radiotelephony in the frequency bands between 4 000 kHz and 27 500 kHz shall comply with technical characteristics specified in Recommendation ITU-R M.1173-1. (WRC-15) 52.230 D − Bands between 156 MHz and 174 MHz D1 − Call and reply MOD 52.234 b) by coast stations to announce the transmission on another frequency of traffic lists, in accordance with Recommendation ITU-R M.1171-0, and important maritime information. (WRC-15) MOD 52.240 8) Before transmitting on the frequency 156.8 MHz, a station shall, in accordance with Recommendation ITU-R M.1171-0, listen on this frequency for a reasonable period to make sure that no distress traffic is being sent. (WRC-15)